ngk tr5's or tr6's
01-02-2007, 09:27 PM
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ngk tr5's or tr6's My 408 is almost done ane I need to know what spark plugs to order. I am having the heads ported and polished and milled a little bit to keep the compression at the stock level. What plug should I do? I read somewhere on here that tr6 for anything over 400 hp. Is that true?
